230 V Light sensitive circuit diagram

Hi every one today I'm going to give you 230 V light sensitive circuit diagram.When it is getting dark light switches on automatically.If you are under 18 years old Don't try this circuit diagram .To get positive results build this circuit on a PCB.

Note: 230V is dangerous.It can kill you

Simple LED Flasher circuit Diagram

Hi friends Here is a very Simple LED flasher circuit diagram.Here we have used common transistor 2N3904 transistor.This circuit can be operated with 6V power supply.I have attached this circuit with my foot bicycle.

At night it gives a fantastic view for the bicycle.

Note: Don't use over 6V power

         Build this circuit on a PCB

Simple Buzzer Circuit Diagram

Hi friends today I'm going to give you a simple buzzer circuit diagram.This circuit operates with IC NE 555 .And also this circuit can be operated with 5V to 15V. By changing the variable resistor you can change the frequency.

Note:
# To get good result use 8 Ohm speakers.
# Build this circuit on a P.C.B

150Mhz Dipole Antenna

Hi every one today I'm going to give you a simple 150 Mhz dipole antenna.If I say simply this is a VHF antenna .Each dipole should be 49cm .always use hi quality co-ax cable.Try this and see the results

Note: Don't use poor quality co-ax cable.

       

12V VHF TV transmitter circuit diagram

Hi all today I'm going to give you a Tv transmitter circuit diagram..Actually  Tv transmitters are ban in some countries. So If build this build it with your own risk.Here we have used transistor BC 108.This circuit can be operated with 12V power supply.With out supplying an antenna don't supply power for the circuit.With this circuit diagram you can send signals up to 75 m to 100 m.Try this circuit and have a nice day.

Note : # Use  correct turns when you make L1

           # Build this on a PCB

9V Simple LED Lamp

Today I'm going to give you 9V LED circuit diagram.I have fix this circuit diagram for my foot bicycle.When you build this build this circuit on a PCB.And also use connectors when you attach 9V battery to the circuit.

Note

        # By changing the value of the resistor you can add more LED bulbs for this circuit

220V Blinking LED Circuit Diagram

Have a good day every one!.Today I'm going to give you a very useful circuit diagram.we can use this circuit for various purposes.This circuit runs with 220V so if you are a guy below 18 do't try this circuit.When you buy electronic parts always buy correct voltage and wattage.I hope that you would enjoy with this circuit .Hope to meet you soon with another circuit diagram.

Note 

         # If  you are a child don't try this circuit

         # Build this circuit diagram on a PCB

LED running Lights according to the Music

Here I'm going to give you a circuit diagram which is sensitive to sound.According to the sound this will blink its LEDs..Here we have used Tip31 transistor to light up the leds.But that power is not enough so I have used Lm386 Ic to boost the power of music.This whole circuit can be operated with 12v power.

Note

         # Build this circuit on a pcb

         # Add heat sink for transistor and ic if it is getting too heat

         # This circuit is not tested and we have done this according to a concept of a member.

         # you also can send us your circuit diagrams to our Email  

120V LED Lamp Circuit Diagram

Hi every one May you have a good day.Most of members asked about 120V LED Lamp circuit Diagram.You all know Free circuit Diagrams 4U is a web site which is giving wide range of electronic circuit diagrams.When you build this circuit Build this circuit on a PCB.And also Don't forget to add a fuse for this circuit diagram.When you use electronic equipment always use correct watt value.

Note:

        # If you are under 18 years old Don't try this circuit diagram

        # Be careful when you deal with 120V. Because it is deadly 

Simple Bug Circuit Diagram

Today I'm going to give you a simple bug circuit diagram.By using this circuit you can send your FM signals up to 30-50 M. Here the coil is tapped at the 6th loop.We have used common transistor 2N2222. And also this circuit can be operated with 3V power supply.When you build this circuit build this circuit in a small space.Antenna should be 1 feet to 3 feet.With this circuit you will be able to transmit FM signals between  90Mhz to 180 Mhz.

Note: 

         # To get maximum advantage build this on a PCB

         #  Don't exceed 3V

Simple Fm transmitter circuit Diagram

Today I'm going to give you a FM transmitter circuit.The most impotent thing of this circuit is we can operate this circuit with 1.5V power supply.L1 should be 5 turns of 0.7mm enameled wire wound on 3mm form.Here we have used  2SC9018 transistor.Fix 12 inch antenna .with this circuit we could transmit radio signals up to 

30 m.

Note :  #  This is only for educational purpose 

           #  Build this circuit on a PCB   

Simple music circuit

Hi We all like to make music circuits .So today I'm going to give you a very useful circuit diagram.Actually this circuit operates with common Ic called UM66.And another important thing is this circuit runs with 3V power supply. By using BC 548 the power of the sound has been increased.I think you will enjoy with this circuit diagram.

Not e: Build this circuit on a pcb

           Don't supply over 3V

24V Dc to 12V DC converter circuit diagram

Hi guys today I'm going to give you 24V to 12V converter circuit diagram.Most of the heavy vehicle drivers asked me about this.Here we have used IC LM 338.With out connecting a heat sink don;t power up the circuit.We hope to give you more 24V DC circuit diagrams.And also this circuit can generate only 5A don't forget it.

Note:  # Build this on a PCB

          # use a heat sink with the IC

1Km Fm transmitter circuit diagram

Hi every one most of you guys asked me about some circuit diagrams which are related to transmitters So today I'm going to give you a very simple but powerful circuit diagram.This circuit can transmit signals up to 1Km in an open space.This circuit powered with 12v power supply.Here we have used very popular  transistor 2n2218.When you design this circuit diagram try to fix all the parts in a small area then you can get positive results.Without fixing an antenna don't give the power to the circuit.As an antenna  fix 30cm wire.So enjoy this wonderful circuit

Note : Don't supply power with fixing an antenna

           Build this circuit on a PCB

           

Simple 12V powerd LED

Today I'm going to give you a very impotent circuit for vehicle owners .Because most of you asked me about 12V Led circuit diagrams .So here is the circuit diagram.This is very simple and you can use three LEDs with this circuit diagrams.We have used only one resistor with this It is 47 Ohm resistor

Note : Be careful when you use 12V high amp batteries